urogenital sinus
nounDefinition of urogenital sinus
1 : the ventral part of the embryonic mammalian cloaca that is formed by the growth of a fold dividing the cloaca where the hindgut and allantois meet and that eventually forms the neck of the bladder and some parts of the urinary and reproductive systems
2 : a rare urogenital abnormality in which the urethral and vaginal tracts open into a common channel and share a single opening
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